A lower mold for take-out box production line

Abstract

The application relates to a lower mould for a take-out box production line, which comprises a lower mould plate, a plurality of cavities arranged on the top of the lower mould plate, a cavity arranged in the lower mould plate, a sandblasting layer at the bottom of the cavity, an air extraction interface arranged at the side end of the lower mould plate and communicated with the cavity, an air extraction deformation film arranged on the bottom wall in the cavity, the circumferential edge of the air extraction deformation film being sealingly connected with the bottom wall of the cavity, a sliding block arranged on the inner wall of the cavity, the sliding block being located above the air extraction deformation film, a ventilation hole arranged on the side wall of the cavity opposite to the sliding block, the sliding block being closed to the ventilation hole when the sliding block is close to the bottom of the cavity, the ventilation hole being opened after the sliding block slides, and a ventilation groove being arranged on the bottom wall of the cavity. Through the air extraction deformation film, the sliding block and the ventilation hole, the hot sheet material can first tightly adhere to the lower mould plate under the condition that each cavity is extracted for a short time, then cold air enters the cavity to rapidly cool the hot sheet material, the effect of first shaping and then cooling is realized, and the quality of the meal box is good.

Description

Technical Field

[0001] This application relates to the technical field of food container production equipment, and in particular to a lower mold for a takeaway box production line. Background Technology

[0002] The lunchbox production line uses a lower and upper mold. First, hot sheet material is transferred to the lower mold. Then, the upper mold presses down on the hot sheet, forming several cavities. After cooling and setting, these cavities are cut and separated to form individual lunchboxes. To ensure the hot sheet material fits the lower mold cavity more closely and prevents the upper mold from impacting it, a cavity is created within the lower mold. The inner wall of this cavity is sandblasted for better ventilation. By evacuating air from the cavity, the hot sheet material adheres tightly to the inner wall, resulting in a more precise fit between the lunchbox and the lower mold cavity. However, in practice, it has been found that to speed up production, the evacuation time for each cavity is shortened, leading to incomplete cooling of the hot sheet material. When the cavity is removed from the evacuation state, the hot sheet material contracts due to its own tension, causing the outer wall of the lunchbox to detach from the outer wall of the lower mold cavity, thus reducing the quality of the lunchbox. Summary of the Invention

[0003] In order to ensure the quality of food containers while producing them quickly, this application provides a lower mold for a takeaway box production line.

[0004] This application provides a lower mold for a takeaway box production line, which adopts the following technical solution:

[0005] A lower mold for a takeaway box production line includes a lower template with several cavities arranged on its top. A cavity is formed inside the lower template, with a sandblasted layer at the bottom. An air extraction port communicating with the cavity is provided on the side of the lower template. An air extraction deformation membrane is provided on the bottom wall of the cavity, with its circumferential edge sealing the bottom wall of the cavity. A sliding block is provided on the inner wall of the cavity, positioned above the air extraction deformation membrane. A vent hole is provided on the side wall of the cavity opposite the sliding block. When the sliding block slides near the bottom of the cavity, it closes the vent hole; when it slides upwards, it opens the vent hole. A ventilation groove is formed on the bottom wall of the cavity.

[0006] By adopting the above technical solution, during use, the hot sheet extruded by the extruder is transferred to the upper mold plate. Simultaneously, the upper mold presses down, and an air pump connected to the suction port draws air into the cavity. Due to the permeability of the borax layer, the hot sheet adheres closely to the cavity of the lower mold plate. As suction continues, the suction deformation membrane deforms, bulging into the cavity, thus lifting and sliding the sliding block upwards, opening the vent. The vent allows cold air to enter the cavity, rapidly cooling the cavity and the hot sheet adhering to the lower mold plate. By minimizing the suction time in each cavity, the hot sheet adheres tightly to the lower mold plate before cold air enters, ensuring sufficient cooling. During cooling, a certain suction force is maintained within the cavity, achieving a shaping followed by cooling effect. When the cavity is no longer under suction, the fully cooled sheet does not shrink, ensuring the outer wall of the lunchbox adheres to the outer wall of the lower mold plate cavity, resulting in high-quality lunchboxes.

[0007] Optionally, the inner diameter of the vent is 2-4 mm, and the number of vents is 10-20.

[0008] By adopting the above technical solution, the vent hole should not be too large. If the diameter of the vent hole is large and there are too many vent holes, when the sliding block slides to open the vent hole, the negative pressure in the cavity will be insufficient, which will cause the sliding block to slide directly to close the vent hole, affecting the entry of cold air into the cavity.

[0009] Optionally, the sliding block is fixed to the top surface of the vacuum deformation membrane.

[0010] By adopting the above technical solution, the sliding block fixes the air-exploding deformation membrane, so that when the air-exploding deformation membrane pushes against the sliding block, the air-exploding deformation membrane will not be worn by the sliding block.

[0011] Optionally, the bottom of the sliding block facing the vent has an avoidance groove, and the bottom of the sliding block is spaced apart from the cavity sidewall where the vent is located.

[0012] By adopting the above technical solution, the setting of the clearance groove makes the bottom end of the sliding block and the inner wall of the cavity where the air hole is located spaced apart, so that a part of the air extraction deformation membrane that will deform is reserved between the sliding block and the inner wall of the cavity, which facilitates the sliding block to be lifted up after the air extraction deformation membrane bulges up.

[0013] Optionally, an air-receiving groove is provided on the side wall of the top of the sliding block facing the vent. When the sliding block slides upward, the air-receiving groove connects to the vent.

[0014] By adopting the above technical solution, when the sliding block slides up, the air inlet groove connects to the air vent, and at this time, cold air enters the cavity. When the air extraction deformation membrane is located at the bottom of the cavity, the side wall of the sliding block fits against the air vent and seals the air vent.

[0015] Optionally, a guide block is provided on the side wall of the sliding block facing the vent, and a guide groove is provided on the side wall of the cavity for the guide block to slide.

[0016] By adopting the above technical solution, and by setting guide blocks and guide grooves, the sliding direction of the sliding block is made to slide.

[0017] Optionally, the guide groove is a constricted groove.

[0018] By adopting the above technical solution, the sliding block is limited in the guide groove, so that the sliding block is in close contact with the inner wall of the cavity when it slides, thereby facilitating the control of the air wall of the vent.

[0019] Optionally, the degassing deformation membrane is a rubber membrane, and the thickness of the degassing deformation membrane is 3-6 mm.

[0020] By adopting the above technical solution, the rubber membrane has good sealing performance. The use of a thicker rubber membrane improves the durability of the vacuum deformation membrane, making it less prone to damage.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. By setting up a suction deformation membrane, sliding block and vent, the hot sheet can be tightly attached to the lower template when the suction time of each cavity is short. Then, cold air enters the cavity to cool the hot sheet quickly, achieving the effect of shaping first and then cooling, resulting in good quality of the lunch box.

[0023] 2. By setting the inner diameter of the vent hole to 2-4mm and the number of vent holes to 10-20, the cavity is kept under negative pressure after the vent hole is opened, the sliding block is not easy to fall off, and the vent hole can be easily and continuously connected to the cavity.

[0024] 3. The vacuum deformation membrane is fixed by a sliding block, and an clearance groove is provided so that the vacuum deformation membrane portion that will deform is reserved between the sliding block and the inner wall of the cavity, so that the vacuum deformation membrane will not be worn by the sliding block when it pushes against the sliding block. Attached Figure Description

[0025] Figure 1 This is an overall schematic diagram of the lower mold used in the lunchbox production line according to an embodiment of this application.

[0026] Figure 2 This is a cross-sectional view of the lower mold used in the lunchbox production line, mainly showing the structure of the cavity.

[0027] Figure 3 yes Figure 2 The enlarged view at point A mainly shows the structure of the vacuum deformation mold, guide block, and guide groove.

[0028] Figure 4This is a partial cross-sectional view of an embodiment, mainly showing the structure of the vent and the air inlet groove.

[0029] Figure 5 This is a schematic diagram of the bottom of the lower template in the embodiment, mainly showing the structure of the ventilation groove.

[0030] Explanation of reference numerals in the attached drawings: 1. Lower template; 11. Cavity; 12. Hole; 13. Sandblasting layer; 14. Vent hole; 15. Vent groove; 2. Air extraction interface; 3. Air extraction deformation membrane; 4. Sliding block; 41. Air receiving groove; 42. Clearance groove; 5. Guide block; 6. Guide groove. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0032] This application discloses a lower mold for a takeaway box production line. (Refer to...) Figure 1 , Figure 2 The lower mold used in the lunchbox production line includes a lower template 1. Several cavities 11 are arranged on the top surface of the lower template 1. After the upper mold presses down, the hot sheet is pressed into the cavity 11. A cavity 12 is opened in the lower template 1. The bottom of the cavity 11 is a sandblasted layer 13. The sandblasted layer 13 has good air permeability, which allows the cavity 12 and the cavity 11 to communicate. At the same time, the small pore size of the sandblasted layer 13 makes the surface of the produced lunchbox relatively flat.

[0033] Reference Figure 2 , Figure 3 The lower template 1 has an air extraction port 2 connected to the cavity 12 at one side, which is used to connect an air pump. An air extraction deformation membrane 3 is fixed to the bottom wall of the cavity 12, and the circumferential edge of the air extraction deformation membrane 3 is sealed to the circumferential edge of the bottom wall of the cavity 12.

[0034] Reference Figure 3 A sliding block 4 is slidably connected to the inner wall of the cavity 12. The sliding block 4 is located above the vacuum deformation membrane 3, and the bottom end of the sliding block 4 is fixed to the top surface of the vacuum deformation membrane 3. A guide block 5 is fixed on the side wall of the sliding block 4 near the cavity 12. A guide groove 6 is provided on the side wall of the cavity 12 for the guide block 5 to slide. The guide groove 6 is a constricted groove, which limits the guide block 5 in the guide groove 6, so that the sliding block 4 is in close contact with the inner wall of the cavity 12 when it slides.

[0035] Reference Figure 4 A vent hole 14 is provided on the side wall of the cavity 12 facing the sliding block 4. An air receiving groove 41 is provided on the side wall of the top of the sliding block 4 facing the vent hole 14. When the sliding block 4 slides up, the air receiving groove 41 connects to the vent hole 14. When the sliding block 4 is at the bottom of the cavity 12, the top of the sliding block 4 closes the vent hole 14.

[0036] Reference Figure 4The inner diameter of the vent 14 is 2-4 mm, and the number of vent 14 is 10-20. In this embodiment, the inner diameter of the vent 14 is 3 mm, and the number of vent 14 is 15.

[0037] Reference Figure 4 The bottom of the sliding block 4 facing the vent hole 14 has an avoidance groove 42. The bottom end of the sliding block 4 is spaced apart from the side wall of the cavity 12 where the vent hole 14 is located, so that a part of the vacuum deformation membrane 3 that will deform is reserved between the sliding block 4 and the inner wall of the cavity 12, which makes it convenient for the vacuum deformation membrane 3 to bulge up and push up the sliding block 4.

[0038] Reference Figure 5 The bottom wall of cavity 12 is provided with a ventilation groove 15, which facilitates the air to enter below the air extraction deformation membrane 3 to balance the air pressure when the membrane is deformed.

[0039] Reference Figure 4 The vacuum deformation membrane 3 is a rubber membrane with a thickness of 3-6 mm. In this embodiment, the vacuum deformation membrane is 5 mm thick, making the thickness of the vacuum deformation membrane 3 moderate, which facilitates deformation while also providing good durability.

[0040] The implementation principle of the lower die used in a takeaway box production line according to this application embodiment is as follows: During use, the hot sheet extruded by the extruder is transferred to the upper die plate 1. While the upper die is pressing down, the air extraction port 2 is connected to an air pump to draw air into the cavity 12. Due to the air permeability of the sandblasted layer 13, the hot sheet fits snugly against the cavity 11 of the lower die plate 1. When the suction continues, the hot sheet blocks the sandblasted layer 13, causing the air extraction deformation membrane 3 to deform. The air extraction deformation membrane 3 bulges into the cavity 12, thereby lifting and sliding the sliding block 4 upward, opening the vent hole 14. Since the cavity 12 is under negative pressure, when the vent hole is opened, the vent hole 14 allows cold air from the outside to enter the cavity 12, thereby rapidly cooling the cavity 12 and also rapidly cooling the hot sheet that fits against the lower die plate 1. When the suction time of each cavity 12 is short, the hot sheet can first adhere tightly to the lower template 1, and then cold air will enter the cavity 12, allowing the hot sheet to cool sufficiently. While cooling, the cavity 11 still maintains a certain suction force, achieving the effect of shaping first and then cooling. When the cavity 12 is removed from the suction state, the fully cooled sheet will not shrink, allowing the outer wall of the lunch box to adhere to the outer wall of the cavity 11 of the lower template 1, resulting in good quality of the lunch box.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A lower mold for a lunchbox production line, comprising a lower template (1), wherein a plurality of cavities (11) are arranged on the top of the lower template (1), a cavity (12) is provided inside the lower template (1), the bottom of the cavity (11) is a sandblasted layer (13), and an air extraction port (2) communicating with the cavity (12) is provided on the side end of the lower template (1), characterized in that: The cavity (12) is provided with a vacuum deformation membrane (3) on its inner bottom wall. The vacuum deformation membrane (3) is circumferentially sealed to the bottom wall of the cavity (12). The cavity (12) is provided with a sliding block (4) on its inner wall. The sliding block (4) is located above the vacuum deformation membrane (3). The cavity (12) is provided with a vent hole (14) on its side wall facing the sliding block (4). When the sliding block (4) slides to near the bottom of the cavity (12), the sliding block (4) closes the vent hole (14). When the sliding block (4) slides upward, the vent hole (14) opens. The cavity (12) is provided with a ventilation groove (15) on its bottom wall. The sliding block (4) is fixed to the top surface of the vacuum deformation membrane (3); The sliding block (4) has a relief groove (42) at its bottom facing the vent (14), and the bottom end of the sliding block (4) is spaced apart from the side wall of the cavity (12) where the vent (14) is located. The sliding block (4) has an air receiving groove (41) on its side wall facing the vent (14). When the sliding block (4) slides up, the air receiving groove (41) connects to the vent (14).

2. The lower mold for a lunchbox production line according to claim 1, characterized in that: The inner diameter of the vent (14) is 2-4 mm, and the number of vents (14) is 10-20.

3. The lower mold for a lunchbox production line according to claim 1, characterized in that: The sliding block (4) is provided with a guide block (5) on the side wall facing the vent (14), and a guide groove (6) is provided on the side wall of the cavity (12) for the guide block (5) to slide.

4. The lower mold for a lunchbox production line according to claim 3, characterized in that: The guide groove (6) is a constricted groove.

5. The lower mold for a lunchbox production line according to claim 1, characterized in that: The degassing deformation membrane (3) is a rubber membrane, and the thickness of the degassing deformation membrane (3) is 3-6 mm.

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